Mat



FIG. 1 is a top plan view of a mat;

FIG. 2 is a bottom plan view of the mat of FIG. 1;

FIG. 3 is a right side and/or a left side view of the mat of FIG. 1, as the left side and right sides views are identical;

FIG. 4 is a front view of the mat of FIG. 1; and,

FIG. 5 is a rear view of the mat of FIG. 1.

The broken lines in the drawing represent environmental subject matter that forms no part of the claimed design. 

The ornamental design for a mat, as shown and described. 